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Make sure that 0 <= b.start <= b.end

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Fixes https://github.com/XTLS/Xray-core/issues/1501
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RPRX 2023-01-09 08:51:51 +00:00 committed by GitHub
parent ed960cc885
commit 7b8ff01114
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1 changed files with 15 additions and 0 deletions
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15
common/buf/buffer.go
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@ -160,6 +160,19 @@ func (b *Buffer) BytesTo(to int32) []byte {
return b.v[b.start : b.start+to]
}
// Check makes sure that 0 <= b.start <= b.end.
func (b *Buffer) Check() {
if b.start < 0 {
b.start = 0
}
if b.end < 0 {
b.end = 0
}
if b.start > b.end {
b.start = b.end
}
}
// Resize cuts the buffer at the given position.
func (b *Buffer) Resize(from, to int32) {
if from < 0 {
@ -173,6 +186,7 @@ func (b *Buffer) Resize(from, to int32) {
}
b.end = b.start + to
b.start += from
b.Check()
}
// Advance cuts the buffer at the given position.
@ -181,6 +195,7 @@ func (b *Buffer) Advance(from int32) {
from += b.Len()
}
b.start += from
b.Check()
}
// Len returns the length of the buffer content.